We select every editorial product independently, though we may be compensated or receive affiliate commissions if you buy something through our links. At the time of publication, ratings and prices were accurate, and items were in stock.
Any device that relies on a battery can die-often at the worst possible time. The batteries can be easily replaced, which is a blessing.
Some newer cars come with a key fob, either a separate device attached to your keyring or integrated into the key itself. These fobs send wireless signals to your car to control it, and they run on batteries. Even though batteries can last anywhere between two and five years or more, if the battery in your key fob is weak, you may not be able to get into your car or start it remotely (one of the many secret uses for your key fob). Key fob batteries are easy to replace, which is good news. You can change the battery in your key fob by following this step-by-step guide.
Look for the Battery Type Embossed in the Plastic
On some key fobs, the battery type is printed on the outside. This way, you won’t have to open the fob to select the battery before going to the store. Duracell, Energizer, and Panasonic are three of the most popular brands of key fob batteries.
The majority of key fobs open in a clamshell fashion, where two halves snap together. You can split the two halves along a seam – sometimes there will even be a notch. Keep your house keys off the keyring if your car still requires you to put the key in the ignition switch. The weight of your house keys can wear down the ignition cylinder, which can be dangerous.
Gently Pry at the Seam or Notch
In order to change the battery in your key fob, you will only need one tool. To open the fob down the middle, pry apart the two halves gently with a small, thin screwdriver (or, sometimes, a sturdy fingernail). Most cars with key fobs and transponder keys won’t let you lock your keys inside the car, but you should be prepared just in case. (If you’re prone to losing your keys, this key finder can help you out).
Look at the Battery Orientation (Positive and Negative Ends)
Usually, batteries resemble small coins, are marked with the battery size, and have a plus and minus sign. Take note of the direction in which the battery is oriented. If you purchase a new battery of the same size, you will need to replace it in the same manner.
Pop the Old Battery Out and Place the New Battery in
It usually pops out with a finger press — if you’re having trouble, you can use that flat-bladed screwdriver. Make sure the plus and minus signs are oriented the same way on the new battery.
Snap Your Key Fob Shut and Test the Fob Function
Putting the fob back together and testing its buttons is the reverse of disassembly. It should be as good as new now!
After you learn how to change the battery in your key fob, check out these unusual car features.